/Engine/Source/Runtime/GeometryCore/Public/DynamicMeshEditor.h
Append input mesh to our internal mesh
void AppendMesh ( const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) * AppendMesh, [FMeshIndexMappings](API\Runtime\GeometryCore\DynamicMesh\FMeshIndexMappings) & IndexMapsOut, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< FVector3d(int, const FVector3d &)> PositionTransform, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< FVector3d(int, const FVector3d &)> NormalTransform )